xterm some strange grey and colours not sharp

screenshot xterm:

<img width="720" height="262" alt="Image" src="https://github.com/user-attachments/assets/a379600f-1d51-4037-aecb-838c76797f04" />

screenshot webmud3-myonara:

<img width="669" height="247" alt="Image" src="https://github.com/user-attachments/assets/4ffb4d3a-0995-457d-bfb2-d00bb6630dc2" />